1. [1]H.W.Loeb,IFreisinger,K.H. Groh,A. Scharmann Stateof theart The RIT-Ionthrusters andtheir spin-offs IAF-88-258,Bangalore 1988
2. [2]J.Freisinger,S.Reinek,E.Rumpf,H.W.Loeb RIT 15-LaboratoryPrototypeof a20 mNNSSK Engine AIAAPaper 76-1038,Florida 1976
3. G.Krulle,E.Zeyfang, W.Birner,H.Mueller AIAA-Paper 81-694,LasVegas 1981
4. H.Bassner,H.Berg,R.Kukies,H.Mueller AIAA-Paper 94-2848 Indianapolis 1994
5. H.Bassner,R.ABond,V.K.ThompsonK.Groh TheESA-XX ionthruster ProceedingsoftheSecondEuropean Spacecraft PropulsionConference, page 251-257 ESTEC,Nordwijk 1997